I've made several attempts, a couple were not bad. It takes practice, and patience.
I suggest you try it with a piece of scrap first, and work out the bugs of how to do it.
I took the existing stock, layed it on top of the board, and drew a rough outline. I cut around it leaving lots of wood to work with, and then rasped from there.
You will need wood working tools. Gouges and such. You can cheat, using Dremels, routers, even Dado blades, but you must be carefull, as power tools cut very fast, and you can't put the wood back on if you screw up.
Take your time. If you are not in a mood to work at it uninterupted and with devotion, set it aside and work at it later. Never work at it for very long, or you will get bored and take a short cut, and screw it up.
You can do it, but be prepared to take some time, and screw up some wood.